Transformation of primary care settings implementing a co-located team-based care model: a scoping review

Background In Canada, primary care reforms led to the implementation of various team-based care models to improve access and provide more comprehensive care for patients. Despite these advances, ongoing challenges remain. The aim of this scoping review is to explore current understanding of the functioning of these care models as well as the contexts in which they have emerged and their impact on the population, providers and healthcare costs. Methods The Medline and CINAHL databases were consulted. To be included, team-based care models had to be co-located, involve a family physician, specify the other professionals included, and provide information about their organization, their relevance and their impact within a primary care context. Models based on inter-professional intervention programs were excluded. The organization and coordination of services, the emerging contexts and the impact on the population, providers and healthcare costs were analysed. Results A total of 5952 studies were screened after removing duplicates; 15 articles were selected for final analysis. There was considerable variation in the information available as well as the terms used to describe the models. They are operationalized in various ways, generally consistent with the Patient’s Medical Home vision. Except for nurses, the inclusion of other types of professionals is variable and tends to be associated with the specific nature of the services offered. The models primarily focus on individuals with mental health conditions and chronic diseases. They appear to generally satisfy the expectations of the overarching framework of a high-performing team-based primary care model at patient and provider levels. However, economic factors are seldom integrated in their evaluations. Conclusions The studies rarely provide an overarching view that permits an understanding of the specific contexts, service organization, their impacts, and the broader context of implementation, making it difficult to establish universal guidelines for the operationalization of effective models. Negotiating the inherent complexity associated with implementing models requires a collaborative approach between various stakeholders, including patients, to tailor the models to the specific needs and characteristics of populations in given areas, and reflection about the professionals to be included in delivering these services.


Background
Primary care is defined by the World Health Organization (WHO) as a "model of care that supports firstcontact, accessible, continuous, comprehensive, and coordinated person-focused care" [1].A model of care is a conceptualization and operationalization of how services are delivered, encompassing care processes, organization of providers, management of services and enabling factors to support their development [2].Primary care serves as an accessible entry point for healthcare, providing ongoing care for patients.Primary care also emphasizes prevention and intersectoral collaboration, allowing consideration of the social determinants of health to provide comprehensive treatment [3].
In Canada, primary care services are mostly provided by family physicians and nurse practitioners in family physician clinics, walk-in clinics or privately funded services (e.g., insurer-paid) [4].Primary care providers detect and treat common health issues, monitor chronic diseases, and as necessary, refer patients to medical specialists and other healthcare services [4].In the early 2000s, reforms in primary care were implemented to enhance access to quality healthcare.According to the Quintuple Aim, the indicators of quality healthcare include improving patient experience, population health and healthcare provider satisfaction, reducing healthcare costs, and ensuring health equity [3,4].The Canadian reforms aimed to provide integrated care, facilitate access to psychosocial services, prioritize prevention programs, and address the management of chronic diseases [3,5,6].In 2004, the federal ministry of health set a goal that by 2011, 50% of Canadians should have 24/7 access to a multidisciplinary primary health care team [7].This objective led to the emergence of various primary care groups and networks, for example, the Groupes de médecine familiale (Family Medicine Groups, FMG) in the province of Quebec and the Family Health Teams (FHT) in the province of Ontario [3].These models are considered co-located team-based primary care models; that is, an interprofessional team collaborates with family physicians in the same location, regardless of the services provided (e.g., mental health care, medical care).These models require the optimization of professional roles so that the right care is delivered by the appropriate professional according to their expertise [8,9].Optimizing professional roles means that professionals mobilize their expertise to a greater extent consistent with their respective scope of practice [9,10].Role optimization relies on strong interprofessional collaboration within the team to provide effective and comprehensive care [11].Models of care resulting from the primary care reform, such as the FMG or FHT, were anchored in the Patient's Medical Home (PMH) vision, which focuses on delivering quality care to patients throughout their lives [12].In this vision, the family physician plays a central role as the principal primary care provider.To ensure the successful functioning of the model consistent with this vision and the accessibility of care, an interprofessional team working in the same physical space with optimized professional roles collaborates with family physicians to support them in providing prevention and health promotion, psychosocial services and chronic disease management to the general population.The patient can consult an appropriate professional, even if it's not their family physician, as collaboration and communication within the team keep the family physician involved as needed, ensuring effective care coordination.Other models based on interprofessional collaboration exist.However, these models tend to be coordinated intervention programs designed to deal with specific problems in certain primary care settings, for example, a program for people with chronic obstructive pulmonary disease [13] or an intervention for depression, diabetes or cardiovascular diseases [14].These interprofessional interventions differ from the regular services offered in FMGs, possibly cutting across several primary care settings, albeit still requiring collaboration with family physicians.
Although FMGs and FHTs represent examples of significant advancements in the evolution of Canadian primary care services, including their alignment with the PMH perspective, further progress is required, as the initial objectives of these models have not been entirely achieved.For example, with respect to FMGs, a considerable proportion of the population in Quebec still lacks access to a family physician, hospital emergency departments are not adequately relieved of congestion, and access to psychosocial services remains limited [15].Given these ongoing challenges, it is important to better understand innovative co-located primary care teambased models to identify what is effective, with a view to identifying elements that will contribute towards better meeting the needs of the populations in Quebec, in other Canadian jurisdictions, and elsewhere.Some reviews have been published that deepen the understanding of primary care models that involve different forms of co-located team-based care [16][17][18][19]; some promising results have emerged.For example, Norful and colleagues [19] demonstrated that there is a significantly better adherence to recommended care guidelines within models where there is co-management between nurse practitioners (NPs) and physicians.A reduction in health services utilization (e.g., emergency room visits) has been demonstrated in some investigations when patients are managed within team-based care models [17,18].Despite the usefulness of these findings, these reviews generally focus on a single dimension of the models.
When the focus is on an organisational model for a given population, the results tend to concern population health outcomes [16,18], and more rarely economic outcomes [17], and do not describe how each model works, which makes it difficult to reproduce them.Conversely, when the research focuses more specifically on how the model functions with respect to interprofessional collaboration [20] or on the context in which the models are implemented [21], the evaluation of the impact of these models on the population and healthcare is rarely included, which makes it difficult to assess their performance.Longhini and colleagues' [22] review adopted a more integrated approach by presenting elements of the functioning of the different models of care identified and the impact on the population and healthcare.However, this review's findings are limited to people with chronic illnesses, and do not provide information on the contexts in which the models are implemented.
Thus, the existing reviews have rarely provided an integrated overview of the composition of teams, the organization of the model of care, details of the context in which the model of care was implemented, and the impact on the population, professionals and the economy of the healthcare system.To facilitate the development and improvement of team-based care models, it is essential to have a better understanding of the functioning of these models and to have an overall vision that considers the inherent complexity of how these models work.Consistent with our earlier definition of model of care [2], functioning refers to the selection and organization of services (e.g., care processes, type of providers), the management of services, and enabling factors (e.g., financing, resources, system to support collaboration and improve quality).
In this article we report the findings of a scoping review of the studies that have examined the functioning of colocated team-based primary care models in their specific contexts.This review includes three sub-objectives: 1. Identify how these co-located models are operationalized within environments with respect to service organization and coordination; 2. Identify in response to which needs and/or in which contexts these models have emerged; 3. Identify the impact of these models on the population, providers and healthcare costs.

Methods
We chose to carry out a scoping review because this approach permits the development of a portrait of the literature on a relatively vast subject [23], which is relevant given our goal of obtaining an overview of existing co-located team based primary care models, without restricting ourselves to a specific population or a particular context.We adhered to Arksey and O'Malley's [23] guidelines in conjunction with Levac and colleagues' [24] approach to guide this scoping review, which follows five steps: (1) identify the research question; (2) identify relevant studies; (3) select study by specifying inclusion and exclusion criteria; (4) charting the data; (5) collating, summarizing and reporting the results.

Identifying the research question
The research question that guided this scoping review is as follows: How do co-located primary care models based on interprofessional collaboration function in their specific context?

Identifying relevant studies and study selection
Our initial search was conducted in May 2022, and was subsequently updated in October 2023.Consistent with the socio-medical nature of our research question, we searched the MEDLINE and CINAHL databases, which cover health and other topics related to health care disciplines.We used the following three main keywords, including their variations and the appropriate thesaurus for each database, in English, to identify relevant studies: 'primary care, ' 'interprofessional collaboration' , 'model ' .We focused on the concept of interprofessional collaboration, as this concept is broader than role optimization, with the latter relying on interprofessional collaborative practices.The addition of the concept model was made with a focus on models of care and to exclude intervention programs as well as the sole description of interprofessional collaborative practices.This search strategy was reviewed by a librarian, who informed us about the variability of terms and their meanings in the literature, thus increasing the precision of our search strategy and better ensuring that we captured all potentially relevant articles.The detailed search strategy used for MEDLINE (conducted in EBSCOhost) is available in Table 1.
Two reviewers conducted the initial screening (reviewing titles and abstracts) based on inclusion and exclusion criteria presented in the next section.Subsequently, the selected articles were read integrally.To ensure rigour in this process, the two reviewers independently performed both screenings and subsequently consulted with each other to reach a consensus about the articles to be included.In case of any impasse, a third reviewer was involved.Because of the variability of the concepts' definitions used in the articles, the three reviewers met regularly to ensure a common understanding of each article.During the screening, it was necessary to refine the inclusion and exclusion criteria due to several nuances encountered in our readings.Two additional researchers were consulted as needed to verify the analysis of the selected articles given the complexity of the subject.

Selecting inclusion and exclusion criteria
The following inclusion and exclusion criteria were applied: (1) Empirical research that evaluated a primary care team-based model; we excluded research protocols and literature reviews.(2) The co-located team-based model had to be operationalized in a primary care context; any articles focused on, for example, hospital settings were excluded.(3) Given our interest in models of care involving the integration of healthcare professionals co-located with family physicians to support primary care provision, models based on inter-professional intervention programs across several primary care settings were excluded.(4) An interprofessional team utilizing the co-located collaboration model had to be in operation within the care setting.(5) Because our interest lies in models similar to FMGs and FHTs that rely on the collaboration and the optimization of roles between a family physician and other professionals, the team had to include a family physician, and the articles had to clarify the types of professionals present.(6) The studies had to include assessment of the impact of the models on the population, professionals and/or costs for the healthcare system.In this regard, articles that solely described collaboration dynamics, interprofessional collaboration skills, and the introduction of a new professional, were not included.(7) Consistent with our focus on the Canadian context, we only included studies conducted in countries with a predominantly Western culture (e.g., Western Europe, North America, Australia, New Zealand) given their greater potential applicability to this context.(8) Studies were published since 2000, based on the relatively recent evolution in primary care models.(9) Studies were published in English or French, given the authors' mastery of both languages.

Charting the data
We conducted an initial data extraction by charting the selected articles to identify key elements relevant to our research objectives.First, we highlighted the practice setting to understand the type of primary care organization (e.g., family medicine clinic, community center).Subsequently, to understand how the models are operationalized with respect to the organization and coordination of services (Objective 1), keeping in mind our interest in optimizing professional roles, we extracted information relating to: the type of professionals present in each of the teams; the principle orientation of the services offered (e.g., mental health, chronic illness); the access methods to these professionals and the patient's trajectory in the setting; the systems used to support collaboration and communication (e.g., use of a shared electronic medical record, patient registry, interprofessional meetings) and the type of management.This data will help to document the selection, organization and management of services, especially regarding interprofessional team-based organization [2].Communication, which is supported by the use of technology, is an essential part of team-based organization [25].We also identified the model of care approach, as described by the authors; this approach refers to the overall vision that underpins the design and delivery of healthcare services based on patient needs and clinical best practices [26].Subsequently, we created a category to collect data regarding the contexts in which these models emerged (Objective 2).Specifically, we extracted data related to the socio-professional context, the socio-demographic characteristics of the population in the target area, and the nature and origin of the support received for the model's operation (e.g., provincial funding, a local initiative supported by the city).Understanding local contexts and identifying the specific enabling factors within them permits a clearer comprehension of how these models were adapted to meet local needs, opportunities, and constraints [27].We also identified the methodology used in each selected article, including objectives, data collection methods, and sample characteristics.Last, we extracted the main results of the studies documenting the impact of the models on the population, professionals and costs for the healthcare system (Objective 3).

Collating, summarizing and reporting the results
Two reviewers independently created summaries of the gathered information and subsequently compared their respective versions to reach a consensus, ensuring the quality of the retained data.In case of any conflicts, a third person helped resolve the impasse.This process made it possible to synthesize the considerable volume of information extracted and standardize the presentation of the data so that it could be compared.We reported the results according to our three sub-objectives, that is: (1) information that provides a clearer understanding of the organization and coordination of services; (2) information relating to the contexts with the aim of understanding the characteristics of the sector in which the models were implemented and the factors that led to their development; (3) the results relating to the impact of the model and the methodological aspects of the research, in order to make sense of these results.

Description
A total of 5952 studies were screened following the removal of duplicates.Subsequently, 5420 studies were excluded following title and abstract screening, leaving 532 articles requiring full text screening.Following the exclusion of 517 documents, 15 were included in the scoping review.The detailed selection process, including the reasons for exclusion, is shown in Fig. 1.The significant reduction is explained by the fact that most team-based models are coordinated intervention programs designed to treat specific problems (e.g., diabetes, Chronic Obstructive Pulmonary Disease, depressive symptoms, dementia) rather than models of care based on the provision by co-located interprofessional teams of services for a range of conditions (see "Limitations of the study" for further details).Moreover, there was considerable variability regarding the definition of the concept of team, team-based care model, interprofessional teams or integrated care.The team-based models reported have

Model of care approach
Nearly all the studies referred to the model of care approach upon which the practice was implemented in their settings.In Table 2, these approaches are presented using the study authors' definitions provided in their article.When the underlying approach was developed by other authors, the reference is indicated in the first column.In this case, the original definition was provided.Although not consistently stated explicitly by the authors, in all team-based models, complementary services and primary care are delivered in the same location [8].Across the studies, there was considerable variability in the approaches used and how they were defined.This variability reflects different ways of organizing services.For example, multiple variations of a collaborative care model have been presented.Among these variations, one approach highlights the integration of a care manager [28], another the development of the nurse practitioner role [29], while another emphasizes the nature of interprofessional collaboration [30].The most cited approach is the Canadian shared-care model (3/15; 20%) designed by Kates and colleagues [31].

Organization and coordination of services in the co-located team-based model
To better illustrate how these approaches are operationalized within service organization and coordination, Table 3 presents, in each column: the principle orientation of services; practice context; team composition; which professional is the first entry point for accessing complementary services, service trajectories, and tools to support interprofessional collaboration within the team-based models.To improve the readability and comparability of the information, each column contains a list of possible options revealed during the results collation stage; more than one option could be selected in accordance with the information presented in the article.When the item did not present any information relating to the category presented in the column, the not specified box was checked.Although all models were situated in a primary care context, seven of these (7/15; 46,7%) were implemented in family medical practices similar to a FMG or a FHT.Two models were community-oriented, for example, the community primary healthcare in Nova Scotia, which provided health promotion activities and programs in a family medical practice but also in other community settings (e.g., outreach programs) [29].The most common service orientation was for people with mental health conditions (10/15; 66,7%) and chronic disease (6/15; 40%).Some models provided services directed to young people or older adults.In mental health, teams are mainly staffed by family physician, nurses, psychiatrists, psychologists and social workers [28,30,[32][33][34][35][36].For chronic diseases, teams generally comprise family physicians, nurses (RN, NP or nurse coordinator) [29,[37][38][39] and medical assistants [29,[37][38][39][40]].An exception is Scanlon and colleagues' [39] model, which includes a social worker.Only the three Ontario (Canada) FHT models integrated both mental health professionals and dieticians [32,41,42].
Regarding which professional is the entry point for accessing complementary services, the FP was the professional most cited (9/15; 60%), followed by nurses (3/15; 20%).These professionals evaluate patients' needs and refer them to other professionals, and, in three (3/15;20%) team-based models, they also use a screening tool to detect mental health problems.In the case of Kates' study [41], dieticians also used screening tools with individuals with diabetes to screen for depression.The trajectory of patients following this initial assessment is infrequently specified in the articles; in only three studies (3/15; 20%) was the existence of a predefined service trajectory or care plan for patients specified.
The management of the team-based models was described in six studies (6/15; 40%) [33,36,[40][41][42][43].They mostly describe how the management roles are shared between professionals or organizations involved, sometimes with a description of these roles, for example: a FP can run the clinic [33]; diverse sites can have one central management team [42]; each practice can be autonomous in decisions [43].

Contexts of emergence of the co-located team-based care models
Consistent with our objectives, we summarized the data regarding contexts to better understand the emerging context of the team-based model and the type of support provided.These data are inconsistently reported across the articles.Nevertheless, we have been able to capture the models' main goals, the sector's

Description provided Country, Articles
Basic collaboration on site (co-located), [60] Mental health and other health care professionals have separate systems but share the same facility.They engage in regular communication about shared patients, mostly through telephone or letters, but occasionally meet face to face because of their proximity [60] USA Moore et al. ( 2018) [ 35 ] Chronic care model [61] An approach that combines delivery system redesign, enhanced use of technology for real-time decision making, and patient self-management support to produce more productive interactions and thus better outcomes [61] USA Lyon & Slawson (2011) [ 37 ]; Scanlon et al., 2008 [ 39 ] Close collaboration in a fully integrated system (integrated care) [60] Mental health and other health care professionals share the same sites, the same vision, and the same systems in a seamless web of biopsychosocial services.Regular collaborative team meetings are held to discuss both patient issues and team collaboration issues [60] USA Moore et al. ( 2018) [ 35 ] Collaborative care A process whereby primary care and mental health providers share resources, expertise, knowledge and decision-making to ensure that primary care populations receive person-centred, effective, and cost-effective care from the right provider in the most convenient location and in the most timely and well-coordinated manner.[30] Norway Rugkåsa et al. (2020) [ 30 ] Collaborative care model (a) Team-based approach that can more efficiently meet population health care demands and individual patient needs through collaborative management.Behavioral health teams, including a care manager, monitor patient progress and outcomes through measurement-informed care facilitated by a patient registry and provide timely treatment adjustment and regular psychiatric case reviews to primary care providers [ Patient's Medical Home, [12] Team-based model of primary care where family physicians work in tandem with interprofessional teams to provide continuous and coordinated person-centred care [12] Canada Ashcroft et al. (2021) [ 32 ] characteristic in which they have been implemented, if they have been implemented in more than one practice site, and the type of support provided.
The type of support documented in the article was limited to the type of financial support provided.When reported, the authors provided varying levels of detail regarding funding.The type of funding received varied significantly.It was possible to discriminate the type of physician's payment and the source of the funding for the complementary services (federal, provincial, private, municipal).The type of physicians' payment was indicated in 3/15 (20%) articles, all situated in Canada [29,32,41].Physicians within these team-based models were primarily compensated through alternative funding arrangements, with capitation-based funding being the most common approach [32,41].Regarding complementary services in the US, Canada and Australia, funding came from federal public funds (3/15; 20%) [28,39,40], private foundations (2/15; 13,3%) [36,43], provincial or state (2/15; 13,3%) [33,41], or a joint federal and provincial initiative [34].One model was funded by a local public program (Mental Health and Nutrition Program in Hamilton, Canada) [42].In another model located in Norway, physicians were paid in three different ways (capitation based, fee-for-service, co-payments by patients).In this model, although mental health professionals provided a free service to patients, these services could not be funded if not provided within these professionals' own employment structure [30].

Impacts on population, providers and healthcare costs
Study objectives, design, participants, and main results are presented in Table 4 to present the information related to the impacts of the team-based primary care models, and the key factors that influenced these impacts.The results regarding impacts were classified according to their target: patients, providers, and cost-effectiveness.The impact of team-based models on patients have been reported in 14/15 (93,3%) studies, while 7/15 (46,7%)        Implementing team-based primary care models: a mixed-methods comparative case study in a large, integrated health care system

USA
The goal was to identify characteristics in the practice settings that contributed to uptake of these new models Models: In team-care (TC), two medical assistants or licensed practical nurses assigned to one physician performed team documentation (scribing) and administrative work.In a second model, or modified team-care (MTC), an additional medical assistant assigned to a group of three physicians (for a total of 4 medical assistants per team) helped with clinical workflow or administrative work Comparative case study of 9 primary care practices where physicians implemented either (or both) of these models using a convergent mixed methods approach Practice observations and informal interviews at 9 sites, follow-up observations at 7 sites 19 FP (13 practicing in team-based models, 5 in usual care at the same sites, 1 was a key informant), 18     studies reported effects on providers.The main effects on patients include: improved access and reduced stigma, especially for individuals with mental health problems [32,41,42]; enhanced chronic disease management [29]; better treatment adherence and follow-up [28,33,35]; better relationship with FP [32][33][34]; and improvement in symptoms or functioning [28,40,41].Positive impacts on providers include: upskilling [33,34,42]; better job satisfaction [33,37]; and redistribution of workloads [37].Some key facilitators of these benefits include: the addition of a care manager [28,35]; strong leadership and support from the management team [29,38,41]; physician's adherence to the model [29,41]; stable staffing [33,38]; individual skills and comfort with new or modified professional roles [29,41,42]; and shared vision of the model [41,43].The lack of adequate funding is the main barrier reported by the studies [29,30,33,42].
Cost-effectiveness has been documented in 2/15 (13,3%) studies.However, although some organisational and cost savings benefits by ensuring more efficient practices have been reported by Fitzpatrick and colleagues [33] and Scanlon and colleagues' study [39], they do not show significant changes in cost or use of healthcare resources.

Team composition, role optimization and organisation of services
The results indicate that team-based care models have been operationalized in various ways within primary care environments.The models reviewed were predominantly implemented in the United States and Canada, which raises the question regarding the contextual elements that might be associated with the implementation of these kinds of models.
The composition of teams in the reviewed models is diverse, encompassing various professionals in addition to family physicians.With minor exception, the models tend to focus either on the provision of mental health services, on chronic disease management, but rarely on both.Team composition appears to be associated with the nature of the services offered.Evidence suggests that the addition of a broader range of health care providers (e.g., pharmacists, nurse) expands the array of services, and that it improves health outcomes [44].Our findings suggest that it is also important to consider the type of professionals involved, as the absence of certain professionals in the team may have an impact on the quality of care, the nature of services provided and the optimal use of roles.For example, Vader and colleagues [45] reported that the absence of a physiotherapist within the team limited the quality of services for patients with chronic low back pain.The integration of dieticians or rehabilitation specialists (e.g., physiotherapists, occupational therapists) also appears to be very limited in the models examined.This finding is of concern particularly regarding chronic diseases given the important role that these professionals play in improving patients' day-to-day health and functioning, promoting prevention, and reducing the use of healthcare system resources (e.g., fewer medical visits and hospitalizations) [46][47][48].Although several models that integrate rehabilitation in primary care exist, most of these are designed for specific populations (e.g., older adults, individuals with disabilities) or in communitybased settings [49].
The organisation of the team-based models included in this review emphasizes the role of family physicians as the primary entry point and assessors of patients' needs, as expected in a PMH model.Nevertheless, a few models relied more on nurses (RN or NP depending on the model) to perform these roles, which suggests a greater use of the nurses' expertise in the team.More generally, some models illustrate the effective integration and versatility of nurses (NPs or RNs), who occupy clinical, coordination and educational roles, as many of the care managers reported were nurses.This finding is consistent with recent studies highlighting both NPs' essential roles in primary care (e.g., managing patients, improving access to care, dealing with complex health care issues) and the need to improve their integration in primary care teams [50][51][52].
Regarding collaboration, most team-based models used tools (e.g., team meetings, shared electronic records) that facilitated communication and coordination among team members.Support from managers appears to be essential for facilitating collaboration.Our findings are consistent with the findings of Wranik and colleagues' [44] systematic review, which revealed strong evidence that co-location, shared tools and appropriate leadership are important factors for collaboration.However, the inclusion of patients as integral participants in care planning appeared to be missing from the models reviewed, highlighting the potential for greater patient engagement.This engagement is recognized as an essential aspect of team-based care, especially in PMH [53].
Our review revealed a wide range of model of care approaches underpinning team-based care, which might reflect the flexibility necessary to cater to different healthcare contexts and patient populations.It is important to understand how these approaches influence the organization and delivery of care.As noted, given that most of the studies reviewed were conducted in North America, some prudence is required regarding their applicability within other countries.

Tailoring the models to the specific characteristics and needs of a sector
The models identified primarily target individuals with mental health conditions and chronic diseases.The emphasis on these populations underscores the need for integrated and comprehensive care for individuals with co-morbidities, whether mental health problems or chronic diseases.This point also highlights the necessity to integrate social and health services within the same location, to better respond to these complex healthcare needs [54,55].Some initiatives specifically target districts with vulnerable or marginalized populations, for example, low-income communities, highlighting the models' required adaptability to address health disparities.This orientation is consistent with the fifth aim of primary care transformation [5].
No universal socio-demographic or socio-professional characteristics in favor of the development of these team-based models emerged in our review.Rather, what appears to be important is the careful study of the specific characteristics and needs of a sector.Nevertheless, the results permit the identification of elements to consider when implementing a team-based model: the sector (urban, suburban, rural); the population's need for services (e.g., mental health, chronic diseases); the type and ratio of professionals available in the sector, and consequently, the professionals required.The goal is to match the supply, access to, and quality of services in a sector and the population's need for services (type of physical and mental health problems).These elements reinforce Tomoaia-Cotisel and colleagues' [21] highlighting of important contextual factors at multiple levels (level 1: external environment; level 2: larger organization; level 3: practice), diverse perspectives and data source, and the interactions between contextual factors and both the process and outcome of studies.

Limited integration of population health outcomes, patients' and providers' experience and healthcare costs
Our review provides some insights into the outcomes of team-based care models, which encompass a range of benefits for patients and providers.Although some prudence in interpretation is required given that we did not evaluate the methodology of the studies, the models examined appear to generally satisfy the expectations of the overarching framework of a high-performing teambased primary care model at patient and provider levels [3,6,56].On the other hand, the studies revealed few outcomes regarding prevention and patient self-management, even though these are important goals of primary care reform [3].
Only two articles provide results, which are inconclusive, regarding cost-effectiveness [33,39].These findings are consistent with those of other studies that have examined various forms of physician and complementary services financing under different models in North America and their cost-effectiveness [17,57].Furthermore, our results suggest that there has been little integration of qualitative data regarding patients' experiences with the cost effectiveness data.
Several studies in our review discussed factors that facilitated or hindered positive outcomes for patients and providers (e.g., inadequate funding, presence of care managers, physician adherence, stable staffing, individual skills, shared vision).These results are consistent with Rawlinson and colleagues' [20], analysis, in which these barriers and facilitators were classified into four categories: system (e.g., financing, supportive policies and government), organizational (e.g., co-location, effective leadership, shared data system, staffing), inter-individual (e.g., communication, common goals), individual (e.g., resistance to change, intention to collaborate).
Despite inadequate funding being a common barrier in the implementation of the team-based models, limited descriptions of model funding were provided in the reviewed studies.How funds are allocated, the modalities of professional payment, or reimbursement for services remain unclear, as does the distinction between funding for physicians and supplementary services.Funding arrangements appear to be complex as they involve multiple stakeholders at federal, provincial/state, or municipal levels.

Implications for research
Regarding research implications, it is essential to integrate a multi-level analysis to consider elements from the external environment/system (macro level) such as population needs, funding or government policy; larger organization (meso level) such as co-location, leadership or type of provider available; and at the practice/individual (micro level), for example, communication, individual skills and readiness for change or role optimization, to gain a comprehensive understanding of these models.The importance of integrating economic and quantitative evaluations with qualitative aspects is also recognized.Finally, it will be important to identify the most relevant indicators for assessing a model's performance.

Limitations of the study
The extensive variability in the concepts used, their meanings, and the diversity of implemented models has made the process of selecting and analyzing articles complex.Although the Peek and National Integration Academy Council [58] has attempted to resolve this issue with a lexicon, this tool appears to be seldom used, and was not referred to in our reviewed studies.
In our efforts to maintain rigour, several types of models were not included in this review.Models that rely on the integration of coordinated intervention programs were especially numerous.The TEAMcare, IMPACT, or COMPASS programs are examples of this type of program that target the treatment of depressive symptoms and certain chronic conditions [59].Instead, we have opted for team-based models that rely on the integration of professionals to expand the range of primary care services and improve access without imposing special conditions on access to those services.Furthermore, as our primary focus was on service organization and the context of model implementation, numerous models that could have met the desired model type were excluded.Despite these limitations, the selected articles provided a range of pertinent details.Future research should seek a more comprehensive documentation of these elements and their integration into the model analysis.

Conclusion
Studies rarely provide an overarching view that permits an understanding of the specific contexts, service organization, impact on the population, providers and healthcare costs, and the broader context of implementation.Therefore, it is difficult to identify universal guidelines for the functioning of efficient models.This point highlights the inherent complexity of operationalizing these models.It also underscores the importance of tailoring them to the specific needs and characteristics of a population in a given area, and reflecting on which professionals should be included in the team to truly meet those needs.In this sense, our results permit greater reflection on the deployment of professional role optimization within these co-located team-based models.A collaborative approach with the various stakeholders, including patients, involved in service organization appears to be essential to achieve this outcome.

Table 1
Research strategy used in EBSCOhost for MEDLINE database

Table 3
Organisation of team-based care models and supporting systems

Table 4
Study objectives, design, participants and main results